Yeah, if we want our things (toys and such) to last, we need to take care of them.

Too bad we weren't that careful with ourselves.

None of the manuals I've seen call for anything more exotic than 30W oil (in modern oil I've gone to 10W30). The F134 is a low compression, low speed engine that isn't worked as hard as your Kubota diesel. I really don't know if a magic synthetic oil is warranted.

As for intervals - if we look at your 100 hour change interval - and guess that an M38A1 is going to average about 30 mph - we're at the 3000 mile oil change interval that seems to be pretty standard for us conservative people today. I do agree with your "run it until it gets good and hot, then change the oil" approach. There is stuff in there that is going to come out quickly - and some that will stay a lot longer. The partial flow oil filter will catch some, so dump it at the first change as well.